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<div id=Content><div class="CClass"><div class=CTopic id=MainTopic><h1 class=CTitle><a name="OpenLayers.Event"></a>OpenLayers.<wbr>Event</h1><div class=CBody><p>Utility functions for event handling.</p><!--START_ND_SUMMARY--><div class=Summary><div class=STitle>Summary</div><div class=SBorder><table border=0 cellspacing=0 cellpadding=0 class=STable><tr class="SMain"><td class=SEntry><a href="#OpenLayers.Event" >OpenLayers.<wbr>Event</a></td><td class=SDescription>Utility functions for event handling.</td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Event.Constants" >Constants</a></td><td class=SDescription></td></tr><tr class="SConstant SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Event.KEY_SPACE" >KEY_SPACE</a></td><td class=SDescription>{int}</td></tr><tr class="SConstant SIndent2"><td class=SEntry><a href="#OpenLayers.Event.KEY_BACKSPACE" >KEY_BACKSPACE</a></td><td class=SDescription>{int}</td></tr><tr class="SConstant SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Event.KEY_TAB" >KEY_TAB</a></td><td class=SDescription>{int}</td></tr><tr class="SConstant SIndent2"><td class=SEntry><a href="#OpenLayers.Event.KEY_RETURN" >KEY_RETURN</a></td><td class=SDescription>{int}</td></tr><tr class="SConstant SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Event.KEY_ESC" >KEY_ESC</a></td><td class=SDescription>{int}</td></tr><tr class="SConstant SIndent2"><td class=SEntry><a href="#OpenLayers.Event.KEY_LEFT" >KEY_LEFT</a></td><td class=SDescription>{int}</td></tr><tr class="SConstant SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Event.KEY_UP" >KEY_UP</a></td><td class=SDescription>{int}</td></tr><tr class="SConstant SIndent2"><td class=SEntry><a href="#OpenLayers.Event.KEY_RIGHT" >KEY_RIGHT</a></td><td class=SDescription>{int}</td></tr><tr class="SConstant SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Event.KEY_DOWN" >KEY_DOWN</a></td><td class=SDescription>{int}</td></tr><tr class="SConstant SIndent2"><td class=SEntry><a href="#OpenLayers.Event.KEY_DELETE" >KEY_DELETE</a></td><td class=SDescription>{int}</td></tr><tr class="SClass"><td class=SEntry><a href="#OpenLayers.Events" >OpenLayers.<wbr>Events</a></td><td class=SDescription></td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Events.Constants" >Constants</a></td><td class=SDescription></td></tr><tr class="SConstant SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Events.BROWSER_EVENTS" >BROWSER_EVENTS</a></td><td class=SDescription>{Array(String)} supported events</td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Events.Properties" >Properties</a></td><td class=SDescription></td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Events.fallThrough" >fallThrough</a></td><td class=SDescription>{Boolean}</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Events.includeXY" >includeXY</a></td><td class=SDescription>{Boolean} Should the .xy property automatically be created for browser mouse events?&nbsp; </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Events.extensions" >extensions</a></td><td class=SDescription>{Object} Event extensions registered with this instance. </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Events.Constructor" >Constructor</a></td><td class=SDescription></td></tr><tr class="SConstructor SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Events.OpenLayers.Events" >OpenLayers.<wbr>Events</a></td><td class=SDescription>Construct an OpenLayers.Events object.</td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Events.Functions" >Functions</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Events.destroy" id=link1 onMouseOver="ShowTip(event, 'tt1', 'link1')" onMouseOut="HideTip('tt1')">destroy</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Events.addEventType" id=link2 onMouseOver="ShowTip(event, 'tt2', 'link2')" onMouseOut="HideTip('tt2')">addEventType</a></td><td class=SDescription>Deprecated. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Events.on" id=link3 onMouseOver="ShowTip(event, 'tt3', 'link3')" onMouseOut="HideTip('tt3')">on</a></td><td class=SDescription>Convenience method for registering listeners with a common scope. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Events.register" id=link4 onMouseOver="ShowTip(event, 'tt4', 'link4')" onMouseOut="HideTip('tt4')">register</a></td><td class=SDescription>Register an event on the events object.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Events.registerPriority" id=link5 onMouseOver="ShowTip(event, 'tt5', 'link5')" onMouseOut="HideTip('tt5')">registerPriority</a></td><td class=SDescription>Same as register() but adds the new listener to the <b>front</b> of the events queue instead of to the end.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Events.un" id=link6 onMouseOver="ShowTip(event, 'tt6', 'link6')" onMouseOut="HideTip('tt6')">un</a></td><td class=SDescription>Convenience method for unregistering listeners with a common scope. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Events.unregister" id=link7 onMouseOver="ShowTip(event, 'tt7', 'link7')" onMouseOut="HideTip('tt7')">unregister</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Events.triggerEvent" id=link8 onMouseOver="ShowTip(event, 'tt8', 'link8')" onMouseOut="HideTip('tt8')">triggerEvent</a></td><td class=SDescription>Trigger a specified registered event.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Events.clearMouseCache" id=link9 onMouseOver="ShowTip(event, 'tt9', 'link9')" onMouseOut="HideTip('tt9')">clearMouseCache</a></td><td class=SDescription>Clear cached data about the mouse position. </td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Event.Constants"></a>Constants</h3></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Event.KEY_SPACE"></a>KEY_SPACE</h3><div class=CBody><p>{int}</p></div></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Event.KEY_BACKSPACE"></a>KEY_BACKSPACE</h3><div class=CBody><p>{int}</p></div></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Event.KEY_TAB"></a>KEY_TAB</h3><div class=CBody><p>{int}</p></div></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Event.KEY_RETURN"></a>KEY_RETURN</h3><div class=CBody><p>{int}</p></div></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Event.KEY_ESC"></a>KEY_ESC</h3><div class=CBody><p>{int}</p></div></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Event.KEY_LEFT"></a>KEY_LEFT</h3><div class=CBody><p>{int}</p></div></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Event.KEY_UP"></a>KEY_UP</h3><div class=CBody><p>{int}</p></div></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Event.KEY_RIGHT"></a>KEY_RIGHT</h3><div class=CBody><p>{int}</p></div></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Event.KEY_DOWN"></a>KEY_DOWN</h3><div class=CBody><p>{int}</p></div></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Event.KEY_DELETE"></a>KEY_DELETE</h3><div class=CBody><p>{int}</p></div></div></div>

<div class="CClass"><div class=CTopic><h2 class=CTitle><a name="OpenLayers.Events"></a>OpenLayers.<wbr>Events</h2><div class=CBody><!--START_ND_SUMMARY--><div class=Summary><div class=STitle>Summary</div><div class=SBorder><table border=0 cellspacing=0 cellpadding=0 class=STable><tr class="SGroup"><td class=SEntry><a href="#OpenLayers.Events.Constants" >Constants</a></td><td class=SDescription></td></tr><tr class="SConstant SIndent1 SMarked"><td class=SEntry><a href="#OpenLayers.Events.BROWSER_EVENTS" >BROWSER_EVENTS</a></td><td class=SDescription>{Array(String)} supported events</td></tr><tr class="SGroup"><td class=SEntry><a href="#OpenLayers.Events.Properties" >Properties</a></td><td class=SDescription></td></tr><tr class="SProperty SIndent1 SMarked"><td class=SEntry><a href="#OpenLayers.Events.fallThrough" >fallThrough</a></td><td class=SDescription>{Boolean}</td></tr><tr class="SProperty SIndent1"><td class=SEntry><a href="#OpenLayers.Events.includeXY" >includeXY</a></td><td class=SDescription>{Boolean} Should the .xy property automatically be created for browser mouse events?&nbsp; </td></tr><tr class="SProperty SIndent1 SMarked"><td class=SEntry><a href="#OpenLayers.Events.extensions" >extensions</a></td><td class=SDescription>{Object} Event extensions registered with this instance. </td></tr><tr class="SGroup"><td class=SEntry><a href="#OpenLayers.Events.Constructor" >Constructor</a></td><td class=SDescription></td></tr><tr class="SConstructor SIndent1 SMarked"><td class=SEntry><a href="#OpenLayers.Events.OpenLayers.Events" >OpenLayers.<wbr>Events</a></td><td class=SDescription>Construct an OpenLayers.Events object.</td></tr><tr class="SGroup"><td class=SEntry><a href="#OpenLayers.Events.Functions" >Functions</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent1 SMarked"><td class=SEntry><a href="#OpenLayers.Events.destroy" id=link10 onMouseOver="ShowTip(event, 'tt1', 'link10')" onMouseOut="HideTip('tt1')">destroy</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent1"><td class=SEntry><a href="#OpenLayers.Events.addEventType" id=link11 onMouseOver="ShowTip(event, 'tt2', 'link11')" onMouseOut="HideTip('tt2')">addEventType</a></td><td class=SDescription>Deprecated. </td></tr><tr class="SFunction SIndent1 SMarked"><td class=SEntry><a href="#OpenLayers.Events.on" id=link12 onMouseOver="ShowTip(event, 'tt3', 'link12')" onMouseOut="HideTip('tt3')">on</a></td><td class=SDescription>Convenience method for registering listeners with a common scope. </td></tr><tr class="SFunction SIndent1"><td class=SEntry><a href="#OpenLayers.Events.register" id=link13 onMouseOver="ShowTip(event, 'tt4', 'link13')" onMouseOut="HideTip('tt4')">register</a></td><td class=SDescription>Register an event on the events object.</td></tr><tr class="SFunction SIndent1 SMarked"><td class=SEntry><a href="#OpenLayers.Events.registerPriority" id=link14 onMouseOver="ShowTip(event, 'tt5', 'link14')" onMouseOut="HideTip('tt5')">registerPriority</a></td><td class=SDescription>Same as register() but adds the new listener to the <b>front</b> of the events queue instead of to the end.</td></tr><tr class="SFunction SIndent1"><td class=SEntry><a href="#OpenLayers.Events.un" id=link15 onMouseOver="ShowTip(event, 'tt6', 'link15')" onMouseOut="HideTip('tt6')">un</a></td><td class=SDescription>Convenience method for unregistering listeners with a common scope. </td></tr><tr class="SFunction SIndent1 SMarked"><td class=SEntry><a href="#OpenLayers.Events.unregister" id=link16 onMouseOver="ShowTip(event, 'tt7', 'link16')" onMouseOut="HideTip('tt7')">unregister</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent1"><td class=SEntry><a href="#OpenLayers.Events.triggerEvent" id=link17 onMouseOver="ShowTip(event, 'tt8', 'link17')" onMouseOut="HideTip('tt8')">triggerEvent</a></td><td class=SDescription>Trigger a specified registered event.</td></tr><tr class="SFunction SIndent1 SMarked"><td class=SEntry><a href="#OpenLayers.Events.clearMouseCache" id=link18 onMouseOver="ShowTip(event, 'tt9', 'link18')" onMouseOut="HideTip('tt9')">clearMouseCache</a></td><td class=SDescription>Clear cached data about the mouse position. </td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Events.Constants"></a>Constants</h3></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Events.BROWSER_EVENTS"></a>BROWSER_EVENTS</h3><div class=CBody><p>{Array(String)} supported events</p></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Events.Properties"></a>Properties</h3></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Events.fallThrough"></a>fallThrough</h3><div class=CBody><p>{Boolean}</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Events.includeXY"></a>includeXY</h3><div class=CBody><p>{Boolean} Should the .xy property automatically be created for browser mouse events?&nbsp; In general, this should be false.&nbsp; If it is true, then mouse events will automatically generate a &lsquo;.xy&rsquo; property on the event object that is passed.&nbsp; (Prior to OpenLayers 2.7, this was true by default.)&nbsp; Otherwise, you can call the getMousePosition on the relevant events handler on the object available via the &lsquo;evt.object&rsquo; property of the evt object.&nbsp; So, for most events, you can call: function named(evt) { this.xy = this.object.events.getMousePosition(evt) }</p><h4 class=CHeading>This option typically defaults to false for performance reasons</h4><p>when creating an events object whose primary purpose is to manage relatively positioned mouse events within a div, it may make sense to set it to true.</p><p>This option is also used to control whether the events object caches offsets.&nbsp; If this is false, it will not: the reason for this is that it is only expected to be called many times if the includeXY property is set to true.&nbsp; If you set this to true, you are expected to clear the offset cache manually (using this.clearMouseCache()) if: the border of the element changes the location of the element in the page changes</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Events.extensions"></a>extensions</h3><div class=CBody><p>{Object} Event extensions registered with this instance.&nbsp; Keys are event types, values are {OpenLayers.Events.*} extension instances or {Boolean} for events that an instantiated extension provides in addition to the one it was created for.</p><p>Extensions create an event in addition to browser events, which usually fires when a sequence of browser events is completed.&nbsp; Extensions are automatically instantiated when a listener is registered for an event provided by an extension.</p><p>Extensions are created in the <a href="#OpenLayers.Events.OpenLayers.Events" class=LConstructor id=link19 onMouseOver="ShowTip(event, 'tt10', 'link19')" onMouseOut="HideTip('tt10')">OpenLayers.Events</a> namespace using <a href="../deprecated-js.html#OpenLayers.Class" class=LClass >OpenLayers.Class</a>, and named after the event they provide.&nbsp; The constructor receives the target <a href="#OpenLayers.Events.OpenLayers.Events" class=LConstructor id=link20 onMouseOver="ShowTip(event, 'tt10', 'link20')" onMouseOut="HideTip('tt10')">OpenLayers.Events</a> instance as argument.&nbsp; Extensions that need to capture browser events before they propagate can register their listeners events using <a href="#OpenLayers.Events.register" class=LFunction id=link21 onMouseOver="ShowTip(event, 'tt4', 'link21')" onMouseOut="HideTip('tt4')">register</a>, with {extension: true} as 4th argument.</p><p>If an extension creates more than one event, an alias for each event type should be created and reference the same class.&nbsp; The constructor should set a reference in the target&rsquo;s extensions registry to itself.</p><p>Below is a minimal extension that provides the &ldquo;foostart&rdquo; and &ldquo;fooend&rdquo; event types, which replace the native &ldquo;click&rdquo; event type if clicked on an element with the css class &ldquo;foo&rdquo;:</p><blockquote><pre class="prettyprint">OpenLayers.Events.foostart = OpenLayers.Class({
    initialize: function(target) {
        this.target = target;
        this.target.register(&quot;click&quot;, this, this.doStuff, {extension: true});
        // only required if extension provides more than one event type
        this.target.extensions[&quot;foostart&quot;] = true;
        this.target.extensions[&quot;fooend&quot;] = true;
    },
    destroy: function() {
        var target = this.target;
        target.unregister(&quot;click&quot;, this, this.doStuff);
        delete this.target;
        // only required if extension provides more than one event type
        delete target.extensions[&quot;foostart&quot;];
        delete target.extensions[&quot;fooend&quot;];
    },
    doStuff: function(evt) {
        var propagate = true;
        if (OpenLayers.Event.element(evt).className === &quot;foo&quot;) {
            propagate = false;
            var target = this.target;
            target.triggerEvent(&quot;foostart&quot;);
            window.setTimeout(function() {
                target.triggerEvent(&quot;fooend&quot;);
            }, 1000);
        }
        return propagate;
    }
});
// only required if extension provides more than one event type
OpenLayers.Events.fooend = OpenLayers.Events.foostart;</pre></blockquote></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Events.Constructor"></a>Constructor</h3></div></div>

<div class="CConstructor"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Events.OpenLayers.Events"></a>OpenLayers.<wbr>Events</h3><div class=CBody><p>Construct an OpenLayers.Events object.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>object</td><td class=CDLDescription>{Object} The js object to which this Events object  is being added</td></tr><tr><td class=CDLEntry>element</td><td class=CDLDescription>{DOMElement} A dom element to respond to browser events</td></tr><tr><td class=CDLEntry>eventTypes</td><td class=CDLDescription>{Array(String)} Deprecated.&nbsp;  Array of custom application events.&nbsp;  A listener may be registered for any named event, regardless of the values provided here.</td></tr><tr><td class=CDLEntry>fallThrough</td><td class=CDLDescription>{Boolean} Allow events to fall through after these have been handled?</td></tr><tr><td class=CDLEntry>options</td><td class=CDLDescription>{Object} Options for the events object.</td></tr></table></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Events.Functions"></a>Functions</h3></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Events.destroy"></a>destroy</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">destroy: function ()</td></tr></table></blockquote></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Events.addEventType"></a>addEventType</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>addEventType: function(</td><td class="PParameter  prettyprint " nowrap>eventName</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Deprecated.&nbsp;  Any event can be triggered without adding it first.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>eventName</td><td class=CDLDescription>{String}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Events.on"></a>on</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>on: function(</td><td class="PParameter  prettyprint " nowrap>object</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Convenience method for registering listeners with a common scope.&nbsp; Internally, this method calls <a href="#OpenLayers.Events.register" class=LFunction id=link22 onMouseOver="ShowTip(event, 'tt4', 'link22')" onMouseOut="HideTip('tt4')">register</a> as shown in the examples below.</p><h4 class=CHeading>Example use</h4><blockquote><pre class="prettyprint">// register a single listener for the &quot;loadstart&quot; event
events.on({&quot;loadstart&quot;: loadStartListener});

// this is equivalent to the following
events.register(&quot;loadstart&quot;, undefined, loadStartListener);

// register multiple listeners to be called with the same `this` object
events.on({
    &quot;loadstart&quot;: loadStartListener,
    &quot;loadend&quot;: loadEndListener,
    scope: object
});

// this is equivalent to the following
events.register(&quot;loadstart&quot;, object, loadStartListener);
events.register(&quot;loadend&quot;, object, loadEndListener);</pre></blockquote><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>object</td><td class=CDLDescription>{Object}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Events.register"></a>register</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>register: function (</td><td class="PParameter  prettyprint " nowrap>type,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>obj,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>func,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>priority</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Register an event on the events object.</p><p>When the event is triggered, the &lsquo;func&rsquo; function will be called, in the context of &lsquo;obj&rsquo;.&nbsp; Imagine we were to register an event, specifying an OpenLayers.Bounds Object as &lsquo;obj&rsquo;.&nbsp; When the event is triggered, the context in the callback function will be our Bounds object.&nbsp; This means that within our callback function, we can access the properties and methods of the Bounds object through the &ldquo;this&rdquo; variable.&nbsp; So our callback could execute something like:</p><blockquote><pre>leftStr = &quot;Left: &quot; + this.left;</pre></blockquote><p>or</p><blockquote><pre>centerStr = &quot;Center: &quot; + this.getCenterLonLat();</pre></blockquote><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>type</td><td class=CDLDescription>{String} Name of the event to register</td></tr><tr><td class=CDLEntry>obj</td><td class=CDLDescription>{Object} The object to bind the context to for the callback#.&nbsp; If no object is specified, default is the Events&rsquo;s &lsquo;object&rsquo; property.</td></tr><tr><td class=CDLEntry>func</td><td class=CDLDescription>{Function} The callback function.&nbsp; If no callback is specified, this function does nothing.</td></tr><tr><td class=CDLEntry>priority</td><td class=CDLDescription>{Boolean|Object} If true, adds the new listener to the <b>front</b> of the events queue instead of to the end.</td></tr></table><h4 class=CHeading>Valid options for priority</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>extension</td><td class=CDLDescription>{Boolean} If true, then the event will be registered as extension event.&nbsp; Extension events are handled before all other events.</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Events.registerPriority"></a>registerPriority</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>registerPriority: function (</td><td class="PParameter  prettyprint " nowrap>type,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>obj,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>func</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Same as register() but adds the new listener to the <b>front</b> of the events queue instead of to the end.</p><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>TODO: get rid of this in 3.0</td><td class=CDLDescription>Decide whether listeners should be called in the order they were registered or in reverse order.</td></tr></table><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>type</td><td class=CDLDescription>{String} Name of the event to register</td></tr><tr><td class=CDLEntry>obj</td><td class=CDLDescription>{Object} The object to bind the context to for the callback#.&nbsp; If no object is specified, default is the Events&rsquo;s &lsquo;object&rsquo; property.</td></tr><tr><td class=CDLEntry>func</td><td class=CDLDescription>{Function} The callback function.&nbsp; If no callback is specified, this function does nothing.</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Events.un"></a>un</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>un: function(</td><td class="PParameter  prettyprint " nowrap>object</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Convenience method for unregistering listeners with a common scope.&nbsp; Internally, this method calls <a href="#OpenLayers.Events.unregister" class=LFunction id=link23 onMouseOver="ShowTip(event, 'tt7', 'link23')" onMouseOut="HideTip('tt7')">unregister</a> as shown in the examples below.</p><h4 class=CHeading>Example use</h4><blockquote><pre class="prettyprint">// unregister a single listener for the &quot;loadstart&quot; event
events.un({&quot;loadstart&quot;: loadStartListener});

// this is equivalent to the following
events.unregister(&quot;loadstart&quot;, undefined, loadStartListener);

// unregister multiple listeners with the same `this` object
events.un({
    &quot;loadstart&quot;: loadStartListener,
    &quot;loadend&quot;: loadEndListener,
    scope: object
});

// this is equivalent to the following
events.unregister(&quot;loadstart&quot;, object, loadStartListener);
events.unregister(&quot;loadend&quot;, object, loadEndListener);</pre></blockquote></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Events.unregister"></a>unregister</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>unregister: function (</td><td class="PParameter  prettyprint " nowrap>type,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>obj,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>func</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>type</td><td class=CDLDescription>{String}</td></tr><tr><td class=CDLEntry>obj</td><td class=CDLDescription>{Object} If none specified, defaults to this.object</td></tr><tr><td class=CDLEntry>func</td><td class=CDLDescription>{Function}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Events.triggerEvent"></a>triggerEvent</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>triggerEvent: function (</td><td class="PParameter  prettyprint " nowrap>type,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>evt</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Trigger a specified registered event.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>type</td><td class=CDLDescription>{String}</td></tr><tr><td class=CDLEntry>evt</td><td class=CDLDescription>{Event}</td></tr></table><h4 class=CHeading>Returns</h4><p>{Boolean} The last listener return.&nbsp;  If a listener returns false, the chain of listeners will stop getting called.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Events.clearMouseCache"></a>clearMouseCache</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">clearMouseCache: function()</td></tr></table></blockquote><p>Clear cached data about the mouse position.&nbsp; This should be called any time the element that events are registered on changes position within the page.</p></div></div></div>

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<!--START_ND_TOOLTIPS-->
<div class=CToolTip id="tt1"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">destroy: function ()</td></tr></table></blockquote></div></div><div class=CToolTip id="tt2"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>addEventType: function(</td><td class="PParameter  prettyprint " nowrap>eventName</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Deprecated. </div></div><div class=CToolTip id="tt3"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>on: function(</td><td class="PParameter  prettyprint " nowrap>object</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Convenience method for registering listeners with a common scope. </div></div><div class=CToolTip id="tt4"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>register: function (</td><td class="PParameter  prettyprint " nowrap>type,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>obj,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>func,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>priority</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Register an event on the events object.</div></div><div class=CToolTip id="tt5"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>registerPriority: function (</td><td class="PParameter  prettyprint " nowrap>type,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>obj,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>func</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Same as register() but adds the new listener to the <b>front</b> of the events queue instead of to the end.</div></div><div class=CToolTip id="tt6"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>un: function(</td><td class="PParameter  prettyprint " nowrap>object</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Convenience method for unregistering listeners with a common scope. </div></div><div class=CToolTip id="tt7"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>unregister: function (</td><td class="PParameter  prettyprint " nowrap>type,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>obj,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>func</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div><div class=CToolTip id="tt8"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>triggerEvent: function (</td><td class="PParameter  prettyprint " nowrap>type,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>evt</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Trigger a specified registered event.</div></div><div class=CToolTip id="tt9"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">clearMouseCache: function()</td></tr></table></blockquote>Clear cached data about the mouse position. </div></div><div class=CToolTip id="tt10"><div class=CConstructor>Construct an OpenLayers.Events object.</div></div><!--END_ND_TOOLTIPS-->




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